def f_for():
    names = ['Michael', 'Bob', 'Tracy']
    for name in names:
        print(name)

    sum = 0
    for x in range(101):
        sum = sum + x
    print(sum)


def f_while():
    sum = 0
    n = 99
    while n > 0:
        sum = sum + n
        n = n - 2
    print(sum)


def f_break():
    names = ['Michael', 'Bob', 'Tracy', 'Aliance']
    index = 0
    while index < len(names) - 1:
        if names[index] == 'Tracy':
            break
        index += 1
    return index


def f_continue():
    n = 0
    while n < 10:
        n = n + 1
        if n % 2 == 0:  # 如果n是偶数，执行continue语句
            continue  # continue语句会直接继续下一轮循环，后续的print()语句不会执行
        print(n)


f_for()


